Nanotechnology Spotlight – Latest Articles

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Showing Spotlights 9 - 16 of 2140 in category (newest first):

 

Broadband nonlinear photoresponse of 2D titanium disulfide for ultrashort pulse generation and all-optical thresholding devices

photoresponseMotivated by the outstanding performance of graphene, graphene-like 2D materials have been intensively investigated, such as topological insulators, transition metal dichalcogenides (TMDs) and black phosphorous. Recently, 2D titanium disulfide, a typical TMD, is found to have strong light absorption properties from visible to infrared region, which is highly attractive for applications in nonlinear photonics. Researchers have fabricated a novel saturable absorber device is successfully fabricated based on 2D TiS2 nanosheets for ultrashort pulse generation and all-optical thresholding at the communication band.

Dec 27th, 2018

Scalable engineering of 2D porous carbons from solid-state mechanical grinding/ball milling

2D_carbonDue to the unique physical and chemical characteristics, such as good electrical conductivity, low weight, large surface areas, high electrochemical activity, and facile doping of heteroatoms or inorganic species, there are increasing demands of fabricating two-dimensional (2D) porous carbon for lithium-ion batteries, supercapacitors, electrochemical catalysts and many other emerged applications in energy storage and conversion. Researchers now have developed a fast, scalable, and eco-friendly active-salt-templating strategy to engineer different types of 2D porous carbons.

Dec 21st, 2018

Switching peroxidase activity of gold nanoparticles to detect proteolytic biomarker

coated_gold_nanoparticlesNanoparticles that mimic the complexity and function of natural enzymes can act as effective peroxidase to catalyse for the oxidization of 3,3,5,5-tetramethylbenzidine (TMB), generating an oxidised blue-coloured product. For the first time scientists found that when the surface of gold nanoparticle (AuNPs) is coated with casein, the intrinsic peroxidase-mimicking activity of AuNPs is suppressed strongly, i.e. by up to 77.1%, due to the surface shielding effects.

Dec 6th, 2018

Controlling immune response expands the possibilities of therapeutic nucleic acid technologies

nucleic_acidThe idea has been around for a while that selected segments of RNA or DNA could be used therapeutically to affect gene or cell function. The attraction for researchers is the flexibility that these therapeutic nucleic acids' (TNAs) versatility, programmability, and modularity affords them and shows a promising route towards treatment for a wide variety of disorders such as cancer, metabolic disorders, viral infections, cardiovascular and inflammatory diseases. Due to the programmability of RNA and DNA, scientists now are able to embed functional assemblies with controllable immunogenic potential into nucleic acid-based nanoparticles to eliminate the immune response and control the timing of their therapeutic activation.

Dec 5th, 2018

A graphene NEMS switch to protect against electrostatic discharging

suspended_grapheneOne of the most pervasive reliability problems facing the computer chip industry is ESD (electrostatic discharging) failure caused by the rapid, spontaneous transfer of electrostatic charge induced by a high electrostatic field. A novel above-IC graphene based nanoelectromechanical system (NEMS) switch structure for on-chip ESD protection utilizes the unique properties of graphene. This switch is a two-terminal device with a vacuum gap between a conducting substrate at the bottom and a suspended graphene membrane on top serving as the discharging path.

Dec 4th, 2018

'Artificial leaf' uses visible light to accelerate chemical reactions

plasmonicsOver the past several years, metal nanoparticles photosensitization over semiconductors with a large band gap has emerged as a promising strategy for developing visible-light responsive photocatalytic materials. In new work, researchers demonstrate a new plasmonic metamaterial can absorb nearly 100% of incident light (of a specific color) and use this energy to accelerate the production of chemicals. In constructing the near-perfect absorber, the researchers employ gold nanoparticles, TiO2 as the spacer layer, and a continuous gold thin film as the rear reflective layer.

Nov 28th, 2018

Using a virus to make a better type of memory

virusIn a groundbreaking study, researchers have successfully developed a method that could lead to unprecedented advances in computer speed and efficiency. Through this study, researchers successfully developed a method to make a version of biological patterning for nonvolatile memory technology using the M13 bacteriophage - a virus. This possibility leads the way to the nanosecond storage and transfer delays needed to progress modern computing.

Nov 27th, 2018

Whispers about graphene's electrical properties

whispering-galleryScientists report the experimental results of studying the response characteristics in a millimeter wave band whispering gallery mode sapphire resonator to single-layer graphene at different distances of graphene from the resonator. They found that the evanescent field of the resonance system is extremely sensitive to the environment, surrounding materials and disk coatings. A series of experiments showed that such whispering gallery mode resonance can be used to detect the conductivity and thickness of the materials deposited on top and/or can even be used for advanced biosensing.

Nov 21st, 2018